Portland Township, IL Elevation & Topographic Map

Topographic elevation map of Portland Township, Illinois, shaded from 570 ft on the southwest side to 700 ft on the southwest side
Elevation
700 ft 215 m670 ft 205 m650 ft 200 m620 ft 190 m590 ft 180 m570 ft 175 m
Contours every 200 ft, bold every 1,000 ft
USGS 3DEP · U.S. Census Bureau
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How to use this mapviews, tools and data
Elevation
Ground colored by height from green (lowest) to white (highest), with contour lines every 40–500 ft (USGS data).
Satellite
A 2016 satellite photo at 33 ft (10 m) detail; contours off.
3D
Tilt and turn the terrain; hills are raised 1.5×, or set ×1 for true height.
Click or tap anywhere
The exact elevation of that spot in ft and m.
Measure
Pick two points for the climb, descent and grade along a straight line.
Township area
Fades everything outside the official township boundaries (US Census).

Elevation Data

Portland Township sits at about 610 ft (185 m) above sea level, worked out from 2020 Census block heights on USGS 3DEP, weighted by residents.

Typical elevation
610 ft 185 m
most residents: 580–640 ft
Lowest
570 ft 175 m
on the southwest side
Highest
700 ft 215 m
on the southwest side
Average
610 ft 185 m
all land inside township boundaries

Portland Township spans about 130 ft of height, so no single spot tells the whole story. The ruler shows where its people live, and where the other numbers you'll see come from.

FigureElevation
Typical
Where people live: half of residents higher, half lower
610 ft185 m
Highest point
Inside township boundaries, on the southwest side
700 ft215 m
Lowest point
Inside township boundaries, on the southwest side
570 ft175 m
Town center
USGS map point for Portland Township
620 ft190 m
Average of all land610 ft185 m

Elevation profile, west to east

3.7 mi west to east through the town center.

Topographic Map

Topographic elevation map of Portland Township, Illinois, shaded from 570 ft on the southwest side to 700 ft on the southwest side
Township boundaries (dashed) over shaded terrain, with contours every 10 ft (3 m).
Location
Township in Whiteside County, Illinois, United States
Population
427 2024 est.
Land area
34.7 sq mi + 0.9 sq mi water
Density
12 per sq mi
Coordinates
41.6625° N, 89.9801° W
Time zone
Central UTC−6 / −5
Landform region
Central Lowland
Drains to
Mississippi River → Gulf of America
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Sources: U.S. Census Bureau, USGS

Nearby Places

Nearby towns by typical elevation

  1. Newton Township670 ft
  2. Fenton Township640 ft
  3. Yorktown Township620 ft
  4. Prophetstown620 ft
  5. Prophetstown Township620 ft
  6. Lyndon Township620 ft
  7. Portland Township610 ft
  8. Lyndon610 ft
  9. Loraine Township610 ft
  10. Erie590 ft
  11. Erie Township590 ft

Rankings by typical elevation

Peaks and hills nearest, by height

  • Hickory Point720 ft
  • Thunderbolt Hill670 ft
  • Indian Hill, Henry County670 ft
How we measure
  • Typical elevation: the population-weighted median: every 2020 Census block inside the township boundaries, at its USGS 3DEP height, weighted by the people who live there. Half of residents live higher, half lower.
  • Lowest, highest, average: USGS 3DEP bare-earth heights on a 1 arc-second (≈100 ft, 30 m) grid, land only, inside the Census township boundaries (TIGER, Jan 1 2026).
  • Nearby Places: nearby towns and rankings use each town's typical elevation, so every town is compared like for like. Rankings count every city, town, township and census-designated place, including places inside a town. Peaks and hills: the nearest summits with at least 980 ft (300 m) of prominence within 62 mi (100 km), then federal (GNIS) summits within 16 mi (25 km) when there are fewer than 5; each is the 3DEP top on a ~7 ft (2 m) window, or the NGS published height when a usable survey mark sits within 160 ft (50 m) of it (shown as published).
  • Rounding: computed heights are rounded to 10 ft (5 m), or to 1 ft (1 m) under 100 ft; 3DEP is good to about a meter, not a foot. Published figures (FAA airport elevation, NGS survey heights) are shown as their publisher gives them.
  • Datum: North American Vertical Datum of 1988 (NAVD 88). NGS plans to replace NAVD 88 with a new datum (NAPGD2022); heights will then shift slightly.
  • Sources: USGS 3DEP, GNIS, Watershed Boundary Dataset and physiographic provinces; U.S. Census Bureau (boundaries, 2020 blocks, 2024 population estimates, Gazetteer areas); BTS time zones. All public domain.